The Greensboro Coliseum is considering expanding its searing capacity and needs to know both the average number of people who attend events there and the variability in this number. The following are the attendances (in thousands) at nine randomly selected sporting events. Find point estimates of the mean and the variance of the population from which the sample was drawn.

8.8 | 14.0 | 21.3 | 7.9 | 12.5 | 20.6 | 16.3 | 14.1 | 13.0 |

The Pizza Distribution Authority (PDA) has developed quite a business in Carrboro by delivering pizza orders promptly.

8.8 | 14.0 | 21.3 | 7.9 | 12.5 | 20.6 | 16.3 | 14.1 | 13.0 |

Joe Jackson, a meteorologist for local television station WDUL, would like to report the average rainfall for today on this evening's newscast.

8.8 | 14.0 | 21.3 | 7.9 | 12.5 | 20.6 | 16.3 | 14.1 | 13.0 |

The National Bank of Lincoln is trying to determine the number of tellers available during the lunch rush on Fridays. The bank has collected data on the number of people who entered the bank during the last 3 months on Friday from 11 A.M. to 1 P.M. Using the data below, find point estimates of the mean and standard deviation of the population from which the sample was drawn.

242 | 275 | 289 | 306 | 242 | 385 | 279 | 245 | 269 | 305 | 294 | 328 |

Electric Pizza was considering national distributions of its regionally successful product and was compiling pro forma sales data.

242 | 275 | 289 | 306 | 242 | 385 | 279 | 245 | 269 | 305 | 294 | 328 |